高中英语 5 牵手课堂练习课件 外研版必修1 （陕西专版）.ppt

module5alessoninalab一堂实验课 thescienceofastronomyforkids浩瀚的宇宙无边无际 无始无终 这给无数人带来了无尽的遐想 它的神奇和神秘不仅开启了古今中外科学家的探索之路 而且强烈地吸引着孩子们 thescienceofastronomy 天文学 isinteresting therearealotofkidswhoareinterestedintheplanets thesolarsystem theuniverseandeverythingelsethat spartofthisexcitingscience forchildren manypartsofitaremagicalandtheyaredrawntowardsthemoon thestarsandfardistantgalaxies 星系 themoonisearth sonlysatellite ittakesabout27daystotravelaroundtheearth gravity 地心引力 betweenthemoonandearthcausesthetides itsbrightnessinthenightskyattractsmanychildrentolearnmoreaboutit thenthere soursun earthisquitefarfromthesun thedistanceisbetweenabout91millionmilesandabout94millionmiles that sbecauseearth sorbit 轨道 aroundthesunisn tacircle it sanellipse 椭圆 iftherewerenosun wewouldn tbealive ourlightandheatcomesfromthesun over98 ofthetotalstuffinoursolarsystemisinthesun thinkabouthowsmallapersoniscomparedtothat weliveinthemilkywaygalaxy it sfullofspacestuff evenwithallthisstufftofillit it smostlyempty atover100 000lightyearswideand3 000lightyearshigh thatmeansthegalaxyholdsawholelotofnothing thecenterofourgalaxyisabout30 000lightyearsfromearth evenwithallthatspacethereareabout100billionstarsinthemilkyway infactthegalaxywasnamedafterthethickgroupofstarsinthemainpartofit peoplethoughtitlookedlikeastreamofmilk sotheycalleditthemilkyway thereisalotofinformationaboutastronomyforkidsontheinternet kidscaneasilylearnmoreabouttheuniversearoundus true t orfalse f 1 themoonisoneoftheearth stwosatellites 2 mostchildrenlikethemoon sbrightnessverymuch